# -- coding: utf-8 --
# @Time : 2021/2/15--17:59
# @Author : ChinaV
# @File : PY217.py
'''
计算两个列表1s和1t对应元素乘积的和（即向量积），补充PY202.py文件。
1s = [111，222,333,444,555,666，777，888,999]
1t = [999,777，555,333，111，888,666,444,222]
'''

# 请补充若干行代码，完成向量积运算
ls = [111, 222, 333, 444, 555, 666, 777, 888, 999]
lt = [999, 777, 555, 333, 111, 888, 666, 444, 222]
s = 0
for i in range(len(ls)):
    s += ls[i] * lt[i]
print(s)

